Bit



THAN/WE BIT Filed Dec. 29.. 19%5 Pawnee Jai. 10, 1ere.`

BERT TRAVIS, 0F WHITTIER, ALIHQRNM,

BIT.,

Application Asited December 29, 1926. Serial No.. t'i'd,

My invention is a bit torxwell drillin suoli as for oil wells, and is particulary adapted :tor operation in soft formations.,

ll/ly bit is constructed with a pair ofsbort blades at tbe bottom spaced apart, these blades merging into a shank, which has deep longitudinal grooves or recesses with a eentral web and merging into tbe cap part ol" tlie bit. 4The bit is provided Witli tbeusual screw threaded plug to be connected to a suitable soclret and with water ducts passinpgP down on opposite sides oi tbe drill. 'llie blades bave a horizontal cutting ed e which is spiraled inwardly troni tbe outer iameter and eacli ot tbe blades llas a vertical cutting edge which is continued upwardly in tbe opposite parte ot the slianlr... I

y My invention will be more readily understood troni tbe following description and drawings7 in wliicli: l

lFignre l is a yside view, in perspective, ol nay bit.

llipgure 2 is a vertical section taken on tlie line 2-2 ot ll'ig. l, in tbe direction oit tlie arrows' llignre Si is a bottoniview as it talren in tbe direction ont tlie arrow d oit' ll'ig. l. l

-lllie bit is provided witli a pair oit blade vsections l. 'llliese sections nnerge into tbe slianlr F219 tbe slianlr leaving; deep `grooves or recesses 3, leaving1 a central web section t between tbe longitudinal grooves.. yllbe slianlr and tbe web nierge into a cap portion li., di slioulder tl is torined on top oli tbe cap and a screw tlireaded pluri1 l entends npwarci v trein* tbe slioulderi bein adapted to tlireat in a soclret ot tbe dril oit water ducts tl entend A y tbe elioulder and tlie capa te i l site ol tbe web.

" b desJ in detail, it

lower edp d wliicb. itunctions tpe 1lillois ed spiraled in tbe reripical cn sa edge 'ld tbe rear por edgyu lll oit tbe in a vertic Mlrned witb a n "fr el i l portion of the tool.4 1t will be seen by refer ence to the circular liole l'l that tlie side faces 18 of the slianlr portions .are spiraled inwardly to a considerable eatent., rl`he lower rear portion ot the blade indicated at tbe part lil has a, considerable concave curve in a verti cal direction, as well as tlie circuinlerential concave curve, tlius torniinpfl` a species ot pocket which draws the material cut inward ly towards the center ot tbe bit.,

'llie web ta] oers"beinp; narrowest at its lower portion indicated by tbe nnnieral 2U., and widest at tlie upper portion @l wbere. it merges with tbe cap.

The inanner ol' operation o'l'nuy bit is snb stantially as follows:

'llie vertical cutting edge l@ determines the diameter ot tlie liole beinngrF drilled., and the lower edge d being' spiraled inwardly draws tlie material cut in an inward'direcn tion towards tbe arial center ell tlie bit. rllie cutting blades are comparatively sbort and sturdy as coinpared witli tbe inain body ot the slifinlr and web ol" tbe bit tbis slianlt; being ot considerable tbiclrness at tbe botn toni, and thus givin@F sutlicient strength to tbe blades. 'lllie lluid is iluslied tliroupgli tlie ducts il, carryinp; the torination cut upwardly on opposite sides olf tl're bit tliere beinpbr plenty ot clearance on opposite et tlie 'lll `cap to allow the niaterial to be wasbed np wardly.

lVarious clianpges may be inade in tbe ciples opt iny invention witliernt dritroin tlie spirit tbereol".J lto'ttl descriptiona drawings ar,

l claire:

l., bit liavinp; a lie joined by a web tliere ben opposite sides oli tlie web,l a i liornied integral witli and tbe slianlrportion, said bla wardly spiraled lower crt. bit bavinp; a iq tlicre beii lltl on. trl nden elettr des lravinpr an inn.

dll'

tions below the bottom of the web, there ben ing deep grooves on opposite sides of the web forming e concave curve transversely on the shank and web portions, each blade Aand shankfportion having a. vertical cutting edge in alignment, the blade portions extending to the rear fece of the shank portions at the lower end of the web, and the side faces offtheshanks being inwardly spiraled, the lower edge of the blades having,y :i cutting edge spiraled inwardly to a `greater extent then that of the said side`faees.

4. A bit having a pair of shank portions joined by a web, there being deep grooves on opposite sides of the web merging with the shank portions, the lower end of the Leeeeee web being squared? r,y pair of blades extendN ing downwardly from the shank portions., erich of the bledes 'and its eontiguous shank: portion having vertical cutting edge in' alignment, the iront surface of the groove having e concave curve inwardly from the cutting edge, the'lower edge of eeehblede having a Cutting edge forming` e sharper concave curve than the curve above nientioned, the front surface of the blades towards their rear end being eoneeved vertieally and horizontally.

In testimony whereof I have signed my name to this specific-ation.

einer frnnvre.. 

